On 15.01.2018 11:16, Andrew Jones wrote: > On Fri, Jan 12, 2018 at 03:34:13PM +0100, David Hildenbrand wrote: >> We now have the range of free memory, let's initialize the physical >> allocator. It is now possible to use alloc_page()/alloc_pages(). Will rephrase to: "It is now possible to use use malloc and memalign, based on the early-ops. alloc_pages() cannot be used yet (as it has to be initialized via free_pages() - e.g. via setup_vm() - first)." Thanks! > > Commit message isn't quite right. After this patch it's possible to > use malloc and memalign, based on the early-ops, but alloc_pages() > requires the freelist to be initialized first by free_pages(), done > by setup_vm(). > > Actually, since we have four states of memory management setup, > then I think we either need three setup calls: > > state 1: no setup done, no call > state 2: phys-alloc is set up by the phys_alloc_init() call > state 3: alloc_page() is set up, need call that allocates chunk with the > phys-allocator for free_pages() > > (Instead of a chunk, all memory could be given, but then either a > new set of early-ops should be provided that are based on > alloc_page(), or all early memory allocations must use alloc_page()) > > state 4: virtual memory is set up by the setup_vm() call > > Or, simply remove state 2 and its code and alloc-ops, changing all early > allocations to use alloc_page(). If each arch provides an mmu_enabled() > call, then the alloc_ops->memalign call in memalign could be replaced > with > > if (mmu_enabled()) > vm_memalign(...) > else > /* fallback to alloc_pages() */ > > I probably should have written all this in a separate thread, because > I wouldn't want to hold this series up on a rework of the general > memory management framework. But, anyway, thoughts on that? Paolo? > > Thanks, > drew -- Thanks, David / dhildenb
